groupmod - modify a group definition on the system
groupmod [选项] GROUP
The groupmod command modifies the definition of the specified GROUP by modifying the appropriate entry in the group database.
The options which apply to the groupmod command are:
-a, --append GID
-g, --gid GID
The value of GID must be a non-negative decimal integer. This value must be unique, unless the -o option is used.
Users who use the group as primary group will be updated to keep the group as their primary group.
Any files that have the old group ID and must continue to belong to GROUP, must have their group ID changed manually.
No checks will be performed with regard to the GID_MIN, GID_MAX, SYS_GID_MIN, or SYS_GID_MAX from /etc/login.defs.
-n, --new-name NEW_GROUP
-p, --password PASSWORD
Note: This option is not recommended because the password (or encrypted password) will be visible by users listing the processes.
-R, --root CHROOT_DIR
-P, --prefix PREFIX_DIR
The default behavior (if the -g, -N, and -U options are not specified) is defined by the USERGROUPS_ENAB variable in /etc/login.defs.
The following configuration variables in /etc/login.defs change the behavior of this tool:
The groupmod command exits with the following values: